Figure 12. Oxygen isotope records recorded in the
layers of snow of the Greenland ice sheet, shown here as the
departure of the oxygen-18 isotope [d18O in parts per
thousand (o/oo)] versus time (in thousands of years before present).
The right-hand scale shows deviations from mean Holocene
temperatures assuming that the d18O deviation from the
mean Holocene d18O of 34.8 o/oo is caused by local
temperature changes with a d18O-temperature
coefficient of 0.63 o/oo per°C [Source: P. Grootes and M.
Stuiver, University of Washington; and Greenland Ice Sheet Project 2
(GISP2), University of New Hampshire].